Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 194 for “"debonding"”.
-
Interfacial debonding from a sandwiched elastomer layer
… products. A common requirement is that the debonding of the elastomeric layer from the adherends be controlled to avoid undesirable failure modes. This level of control may necessitate understanding the collective role of the interfacial adhesion, material properties, part geometries, and …
-
Fracture analysis of debonding mechanism for FRP plates
… flaws in the concrete-FRP interface govern plate debonding, and are not amenable to finite element analysis because the models require far more detail than will ever be available for the interface. This thesis describes a global-energy-balance based fracture-mechanics model for the debonding …
-
Fracture analysis of debonding mechanism for FRP plates
… flaws in the concrete-FRP interface govern plate debonding, and are not amenable to finite element analysis because the models require far more detail than will ever be available for the interface. This thesis describes a global-energy-balance based fracture-mechanics model for the debonding …
-
STRUCTURAL RETROFITTING OF CONCRETE BEAMS USING FRP - Debonding Issues
A 3D nonlinear finite element analysis modelling framework was developed for simulating the behaviour of beams retrofitted with fibre reinforced polymer (FRP). The ABAQUS program was used for this purpose. Concrete was modelled using a plastic damage model. Steel bars were modelled as an elastic …
-
Dynamic Fiber Debonding and Push-Out in Model Composites
As an outcome of the numerical analysis, two major modifications were made to the experimental set-up: (a) stress information near the composite specimen was collected by a combination of quartz crystal transducer-strain gage measurement; (b) the crack initiation and propagation was explored by a …
-
Effects of moisture on debonding in FRP-retrofitted concrete systems
… 10 years, and numerous studies on its short-term debonding behavior have been conducted extensively. Nevertheless, long-term performance and durability issues regarding such debonding behavior still remain largely uncertain and unanswered. In this study, comprehensive experimental and analytical …
-
Influence of Strand Debonding on the Shear Strength of Prestressed Concrete
<p>Strand debonding is a common method used to reduce flexural stresses caused by prestress transfer in the end regions of pretensioned concrete beams. Debonding is especially useful when section geometries prohibit draping such as U-beams. Based on concerns regarding shear strength, the AASHTO …
-
An interdisciplinary study of cathodic debonding in elastomer/metal adhesive bonds
… Two approaches are used in order to model debonding: empirical and analytical. Statistical Analysis System (SAS) is used to fit the empirical model which draws heavily on the functional dependencies of debond rates on the accelerating parameters, i.e., temperature, stress, and applied …
-
Simplified micromechanical models for analysis of interface debonding in a fibrous composite
… micromechanical models to analyze the interface debonding between fiber and the matrix materials. Both analytical and simplified finite element models are used to predict the effective transverse elastic modules of fibrous composites with a partial interface crack based on the material properties …
-
Face Sheet/core Debonding In Sandwich Composites Under Static And Fatigue Loading
<p>Delamination growth due to face sheet/core debonding is a major concern due to its inherent weakness in sandwich composites which can be exacerbated due to the presence of flaws. In this research work The primary objective of this research was to characterize the delamination crack growth …
-
A Comparison of Three Debonding Techniques Employing Two Methods of Tooth Preparation
… of this investigation is to evaluate the three debonding techniques (shear-peel, tension, torsion) using stainless steel brackets and two different methods of tooth preparation (37% phosphoric acid+ primer vs. self-etching primer). The null hypotheses of this investigation are (1) the method of …
-
Modeling the effect of debonding on the constitutive response of heterogeneous materials
… and fracture of the particle. Interfacial debonding is often a precursor to the other failure processes and plays a key role in the constitutive response of solid propellant, a compliant elastomeric matrix containing a high volume fraction of stiff particles. These particles range from a …
-
A fracture-based approach to understanding debonding in FRP bonded structural members
… quantitative observation of the changes in the debonding behavior and load capacity of the beams with various configurations of shear and/or flexural strengthening and anchorage conditions in four evolutionary experimental stages involving both monotonic and cyclic loading. A dramatic …
-
Debonding in bi-layer material systems under moisture effect : a multiscale approach
… a comprehensive investigation on the interfacial debonding mechanism has been conducted both computationally and experimentally using an epoxy-silica system. In the computational approach, a multiscale model which can predict the intrinsic strength between organic and inorganic materials, based on …
-
Debonding failure of CFRP reinforced concrete beams and in-situ monitoring schemes
… a variety of sudden failure methods, such as debonding, delamination, and creep rupture have led to the development of code limitations on the strength that an FRP system can be considered to provide. The uncertainty brought on by the failure methods mentioned above has become the topic of …
-
NFEA Modeling of RC Beams Having Exposed Longitudinal Reinforcement: Effects of Debonding on Shear Behavior
This study also presents a consistent beam-column element that provides a description of shear response. The element formulation is derived based on a two-dimensional micro-plane approach, where the material state of stress is defined by a two-dimensional state of strain. The advantages of the …
-
Finite Fracture Mechanics and Phase Field Models for Predicting Fatigue, Fracture and Debonding in Composite Structures
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Modelling of debonding mechanisms in externally bonded FRP sheets in RC shear walls for earthquake resistance
… computer model can accurately simulate the IC debonding mechanism under the two-dimensional stress state of the wall panel and the subsequent ductile flexural or brittle shear failure modes of walls with different aspect ratios. Computer simulation results correlate well with experimental test …
-
Debonding and adhesive remnant cleanup: an in vitro comparison of bond quality, adhesive remnant cleanup, and orthodontic acceptance of a flash-free product
… remaining on the tooth surface after bracket debonding, the time required for adhesive remnant cleanup, and clinical practitioners' preference between the new flash-free and a conventional adhesive. Materials and Methods: A total of 160 bovine incisors were bonded with ceramic orthodontic …
Page 1 of 10